However, Waze's service only pays for drivers' gas. Waze doesn't make any money. Uber Pool and Lyft Line let you share rides with other Uber or Lyft customers.

While Waze Carpool isn't a direct competitor to Uber or Lyft, there's always the potential that it could steal riders from the two if the service takes off.

On Monday, Uber announced that David Drummond, an executive at Google's parent company Alphabet, has left the Uber board due to increased competition between Alphabet and Uber. Like Uber, Alphabet is exploring ride-hailing services powered by a fleet of self-driving cars.